we should k_ the balance of nature

we should k_ the balance of nature It is important that we should keep the balance of nature改为简 We think it important to keep the balance of nature upset the balance of nature 英语作文“keep the Balance of Nature” _____ change the balance of nature,we must not hunt the wild We should try to keep the（平衡）of nature man is being punished for breaking the balance of nature. Once the balance of nature is disturbed,it is. the nature of balance is upset还是 upseted? We should learn to enjoy the ---------（beautiful）of nature 按 we must keep the balance of ( ).(自然界)